---
_id: '63734'
abstract:
- lang: eng
text: Quantum dots (QDs) are a promising source of single photons mainly due to
their on-demand operation. However, their emission wavelength depends on their
size and immediate surroundings in the solid-state environment. By applying a
serrodyne electro-optic phase modulation, we achieve a spectral shift up to 0.01
nm (3.5 GHz) while preserving the purity and indistinguishability of the photons.
This method provides an efficient and scalable approach for tuning the emission
wavelength of QDs without relying on nonlinear frequency mixing or probabilistic
processes. Our results show that the electro-optic phase modulation enables stable
and tunable spectral shifts, making it suitable for applications such as quantum
communication, quantum key distribution, and primarily integrating remote quantum
dot sources into large-scale quantum networks.
article_type: original
author:
- first_name: Sanjay
full_name: Kapoor, Sanjay
last_name: Kapoor
- first_name: Aleksander
full_name: Rodek, Aleksander
last_name: Rodek
- first_name: Michał
full_name: Mikołajczyk, Michał
last_name: Mikołajczyk
- first_name: Jerzy
full_name: Szuniewicz, Jerzy
last_name: Szuniewicz
- first_name: Filip Maksymilian
full_name: Sośnicki, Filip Maksymilian
id: '106751'
last_name: Sośnicki
orcid: 0000-0002-2465-4645
- first_name: Tomasz
full_name: Kazimierczuk, Tomasz
last_name: Kazimierczuk
- first_name: Piotr
full_name: Kossacki, Piotr
last_name: Kossacki
- first_name: Michał
full_name: Karpiński, Michał
last_name: Karpiński
citation:
ama: Kapoor S, Rodek A, Mikołajczyk M, et al. Electro-optic frequency shift of single
photons from a quantum dot. Nanophotonics. 2025;14(11):1775-1782. doi:10.1515/nanoph-2024-0550
apa: Kapoor, S., Rodek, A., Mikołajczyk, M., Szuniewicz, J., Sośnicki, F. M., Kazimierczuk,
T., Kossacki, P., & Karpiński, M. (2025). Electro-optic frequency shift of
single photons from a quantum dot. Nanophotonics, 14(11), 1775–1782.
https://doi.org/10.1515/nanoph-2024-0550
bibtex: '@article{Kapoor_Rodek_Mikołajczyk_Szuniewicz_Sośnicki_Kazimierczuk_Kossacki_Karpiński_2025,
title={Electro-optic frequency shift of single photons from a quantum dot}, volume={14},
DOI={10.1515/nanoph-2024-0550},
number={11}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Kapoor,
Sanjay and Rodek, Aleksander and Mikołajczyk, Michał and Szuniewicz, Jerzy and
Sośnicki, Filip Maksymilian and Kazimierczuk, Tomasz and Kossacki, Piotr and Karpiński,
Michał}, year={2025}, pages={1775–1782} }'
chicago: 'Kapoor, Sanjay, Aleksander Rodek, Michał Mikołajczyk, Jerzy Szuniewicz,
Filip Maksymilian Sośnicki, Tomasz Kazimierczuk, Piotr Kossacki, and Michał Karpiński.
“Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” Nanophotonics
14, no. 11 (2025): 1775–82. https://doi.org/10.1515/nanoph-2024-0550.'
ieee: 'S. Kapoor et al., “Electro-optic frequency shift of single photons
from a quantum dot,” Nanophotonics, vol. 14, no. 11, pp. 1775–1782, 2025,
doi: 10.1515/nanoph-2024-0550.'
mla: Kapoor, Sanjay, et al. “Electro-Optic Frequency Shift of Single Photons from
a Quantum Dot.” Nanophotonics, vol. 14, no. 11, Walter de Gruyter GmbH,
2025, pp. 1775–82, doi:10.1515/nanoph-2024-0550.
short: S. Kapoor, A. Rodek, M. Mikołajczyk, J. Szuniewicz, F.M. Sośnicki, T. Kazimierczuk,
P. Kossacki, M. Karpiński, Nanophotonics 14 (2025) 1775–1782.
date_created: 2026-01-26T14:34:16Z
date_updated: 2026-01-26T14:35:42Z
department:
- _id: '623'
- _id: '288'
- _id: '15'
doi: 10.1515/nanoph-2024-0550
intvolume: ' 14'
issue: '11'
language:
- iso: eng
main_file_link:
- url: https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0550/html
page: 1775-1782
publication: Nanophotonics
publication_identifier:
issn:
- 2192-8614
publication_status: published
publisher: Walter de Gruyter GmbH
status: public
title: Electro-optic frequency shift of single photons from a quantum dot
type: journal_article
user_id: '106751'
volume: 14
year: '2025'
...
---
_id: '63732'
abstract:
- lang: eng
text: Time lenses have been recognized as crucial components for manipulating ultrafast
optical pulses in various applications, from ultrafast spectroscopy to the interfacing
of optical quantum systems. A time lens is characterized by its chirp rate, which
determines the focusing strength of the time lens, and accurate knowledge of this
chirp is critical for precise dispersion compensation and minimizing aberrations.
Here, we introduce a tunable time aperture model for sinusoidal time lenses that
provides a more accurate estimate of the effective chirp rate without modifying
the device. We derive a closed-form expression for the maximum phase error and
show how it depends on the time aperture. We experimentally demonstrate a 1.6-fold
improvement in spectral bandwidth compression of Gaussian pulses compared to the
conventional approach. Our framework offers a practical tool for designing efficient
temporal optical systems, benefiting applications in both classical and quantum
optics where accurate spectro-temporal shaping is essential.
article_number: '096111'
article_type: original
author:
- first_name: Sanjay
full_name: Kapoor, Sanjay
last_name: Kapoor
- first_name: Filip Maksymilian
full_name: Sośnicki, Filip Maksymilian
id: '106751'
last_name: Sośnicki
orcid: 0000-0002-2465-4645
- first_name: Michał
full_name: Karpiński, Michał
last_name: Karpiński
citation:
ama: Kapoor S, Sośnicki FM, Karpiński M. Aberration-optimized electro-optic time
lens model using a tunable aperture. APL Photonics. 2025;10(9). doi:10.1063/5.0270904
apa: Kapoor, S., Sośnicki, F. M., & Karpiński, M. (2025). Aberration-optimized
electro-optic time lens model using a tunable aperture. APL Photonics,
10(9), Article 096111. https://doi.org/10.1063/5.0270904
bibtex: '@article{Kapoor_Sośnicki_Karpiński_2025, title={Aberration-optimized electro-optic
time lens model using a tunable aperture}, volume={10}, DOI={10.1063/5.0270904},
number={9096111}, journal={APL Photonics}, publisher={AIP Publishing}, author={Kapoor,
Sanjay and Sośnicki, Filip Maksymilian and Karpiński, Michał}, year={2025} }'
chicago: Kapoor, Sanjay, Filip Maksymilian Sośnicki, and Michał Karpiński. “Aberration-Optimized
Electro-Optic Time Lens Model Using a Tunable Aperture.” APL Photonics
10, no. 9 (2025). https://doi.org/10.1063/5.0270904.
ieee: 'S. Kapoor, F. M. Sośnicki, and M. Karpiński, “Aberration-optimized electro-optic
time lens model using a tunable aperture,” APL Photonics, vol. 10, no.
9, Art. no. 096111, 2025, doi: 10.1063/5.0270904.'
mla: Kapoor, Sanjay, et al. “Aberration-Optimized Electro-Optic Time Lens Model
Using a Tunable Aperture.” APL Photonics, vol. 10, no. 9, 096111, AIP Publishing,
2025, doi:10.1063/5.0270904.
short: S. Kapoor, F.M. Sośnicki, M. Karpiński, APL Photonics 10 (2025).
date_created: 2026-01-26T14:24:34Z
date_updated: 2026-01-26T14:27:42Z
department:
- _id: '623'
- _id: '288'
- _id: '15'
doi: 10.1063/5.0270904
intvolume: ' 10'
issue: '9'
language:
- iso: eng
main_file_link:
- url: https://pubs.aip.org/aip/app/article/10/9/096111/3364187
publication: APL Photonics
publication_identifier:
issn:
- 2378-0967
publication_status: published
publisher: AIP Publishing
status: public
title: Aberration-optimized electro-optic time lens model using a tunable aperture
type: journal_article
user_id: '106751'
volume: 10
year: '2025'
...
---
_id: '63733'
abstract:
- lang: eng
text: We study a possibility of measuring the time-resolved second-order
autocorrelation function of one of two beams generated in type-II parametric down-conversion
by means of temporal magnification of this beam, bringing its correlation time
from the picosecond to the nanosecond scale, which can be resolved by modern photodetectors.
We show that such a measurement enables one to infer directly the degree of global
coherence of that beam, which is linked by a simple relation to the number of
modes characterizing the entanglement between the two generated beams. We illustrate
the proposed method by an example of photon pairs generated in a periodically
poled potassium titanyl phosphate (KTP) crystal with a symmetric group velocity
matching for various durations of the pump pulse, resulting in different numbers
of modes. Our theoretical model also shows that the magnified double-heralded
autocorrelation function of one beam exhibits a local maximum around zero delay
time, corresponding to photon bunching at a short time scale.
article_number: '023703'
author:
- first_name: Dmitri B.
full_name: Horoshko, Dmitri B.
last_name: Horoshko
- first_name: Shivang
full_name: Srivastava, Shivang
last_name: Srivastava
- first_name: Filip Maksymilian
full_name: Sośnicki, Filip Maksymilian
id: '106751'
last_name: Sośnicki
orcid: 0000-0002-2465-4645
- first_name: Michał
full_name: Mikołajczyk, Michał
last_name: Mikołajczyk
- first_name: Michał
full_name: Karpiński, Michał
last_name: Karpiński
- first_name: Benjamin
full_name: Brecht, Benjamin
id: '27150'
last_name: Brecht
orcid: '0000-0003-4140-0556 '
- first_name: Mikhail I.
full_name: Kolobov, Mikhail I.
last_name: Kolobov
citation:
ama: Horoshko DB, Srivastava S, Sośnicki FM, et al. Time-resolved second-order autocorrelation
function of parametric down-conversion. Physical Review A. 2025;112(2).
doi:10.1103/7ckm-tm3r
apa: Horoshko, D. B., Srivastava, S., Sośnicki, F. M., Mikołajczyk, M., Karpiński,
M., Brecht, B., & Kolobov, M. I. (2025). Time-resolved second-order autocorrelation
function of parametric down-conversion. Physical Review A, 112(2),
Article 023703. https://doi.org/10.1103/7ckm-tm3r
bibtex: '@article{Horoshko_Srivastava_Sośnicki_Mikołajczyk_Karpiński_Brecht_Kolobov_2025,
title={Time-resolved second-order autocorrelation function of parametric down-conversion},
volume={112}, DOI={10.1103/7ckm-tm3r},
number={2023703}, journal={Physical Review A}, publisher={American Physical Society
(APS)}, author={Horoshko, Dmitri B. and Srivastava, Shivang and Sośnicki, Filip
Maksymilian and Mikołajczyk, Michał and Karpiński, Michał and Brecht, Benjamin
and Kolobov, Mikhail I.}, year={2025} }'
chicago: Horoshko, Dmitri B., Shivang Srivastava, Filip Maksymilian Sośnicki, Michał
Mikołajczyk, Michał Karpiński, Benjamin Brecht, and Mikhail I. Kolobov. “Time-Resolved
Second-Order Autocorrelation Function of Parametric down-Conversion.” Physical
Review A 112, no. 2 (2025). https://doi.org/10.1103/7ckm-tm3r.
ieee: 'D. B. Horoshko et al., “Time-resolved second-order autocorrelation
function of parametric down-conversion,” Physical Review A, vol. 112, no.
2, Art. no. 023703, 2025, doi: 10.1103/7ckm-tm3r.'
mla: Horoshko, Dmitri B., et al. “Time-Resolved Second-Order Autocorrelation Function
of Parametric down-Conversion.” Physical Review A, vol. 112, no. 2, 023703,
American Physical Society (APS), 2025, doi:10.1103/7ckm-tm3r.
short: D.B. Horoshko, S. Srivastava, F.M. Sośnicki, M. Mikołajczyk, M. Karpiński,
B. Brecht, M.I. Kolobov, Physical Review A 112 (2025).
date_created: 2026-01-26T14:28:22Z
date_updated: 2026-03-25T07:59:53Z
department:
- _id: '623'
- _id: '15'
- _id: '288'
doi: 10.1103/7ckm-tm3r
intvolume: ' 112'
issue: '2'
language:
- iso: eng
publication: Physical Review A
publication_identifier:
issn:
- 2469-9926
- 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Time-resolved second-order autocorrelation function of parametric down-conversion
type: journal_article
user_id: '27150'
volume: 112
year: '2025'
...